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ABSTRACT
Discharge phenomena can occur when metals are exposed to microwave radiation. The mechanism of the discharge can be effectively studied by using spectral analysis. In this study, a reactor that can withstand long-term high pressure was used in combination with a spectrometer to investigate the effects of pressure and other parameters on the microwave metal discharge plasma. It was observed that the increase of radiation power, pressure, and metal wire diameter can have positive effects on the intensity of spectral lines. If other experimental conditions remain unchanged, the spectral lines and discharge intensity exhibit dynamic changes because the wire melts and changes its shape under the high local temperature associated with discharge. Because factors like radiation power and pressure can enhance the intensity of the plasma significantly, they can be reasonably utilized to accelerate the chemical reactions or improve the degradation rate of pollutants, e.g. in microwave wet oxidation applications.
Acknowledgements
The authors thank the support of the Natural Science Foundation of Shandong Province (ZR2018MEE030), National Natural Science Foundation of China (Grant 51506116, Grant 51576118 and Grant 51376112), Shandong Science Fund for Distinguished Young Scholars (JQ201514), Young Scholars Program of Shandong University (2016WLJH37), and the Fundamental Research Funds of Shandong University (2016JC004).
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No potential conflict of interest was reported by the authors.
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Notes on contributors
Chao Xue
Chao Xue received his BS degree from China University of Mining and Technology in the year 2016, and is now studying for master's degree at Shandong University. His research area includes microwave-induced metal discharge, microwave catalytic wet air oxidation and microwave liquid phase discharge.
Yanpeng Mao
Yanpeng Mao received his BS and MS degree in Shandong University in 2004 and 2007, and the PhD degree in Shandong University and University of New South Wales in 2012. From 2012 to now, he is a researcher at the School of Energy and Power Engineering, Shandong University. He has published over 40 peer-reviewed articles in a number of international scientific journals, and has been awarded over 7 million in research funding for his work on energy and environment technology issues including microwave-induced metal discharge, microwave catalytic wet air oxidation and microwave liquid phase discharge.
Wenlong Wang
Wenlong Wang received his BS degree in Jinan University Material Science and Technology in 1999 and the PhD degree in Zhejiang University, Power Engineering and Engineering Thermophysics in 2004. From 2004 to now, he was a researcher at the School of Energy and Power Engineering, Shandong University. He is professor in the School of Energy and Power Engineering, Shandong University, China; Deputy Director of National Engineering Lab for Coal-fired Pollutants Emission Reduction (NELCPER), China; Awardee of Shandong Provincial Science Fund for Distinguished Young Scholars; Awardee of UK-China Industry Academia Partnership Program from Newton Fund; Over 70 publications, over 20 patents, and series of awards. His research area includes Solid waste management and utilization, and Pollutants emission control.
Zhanlong Song
Zhanlong Song received his BS and MS degree in Shandong University in 1994 and 2001, and the PhD degree in Institute of thermal engineering, Southeast University in 2006. From 2006 to now, he is a researcher at the School of Energy and Power Engineering, Shandong University. In recent years, he has published more than 30 academic papers, of which more than 20 are included in SCI/EI. His research area includes comprehensive utilization of biomass, organic solid waste, coal conversion and pollutant energy saving and emission reduction.
Xiqiang Zhao
Xiqiang Zhao received his PhD degree in Energy and Power Engineering, Shandong University in 2010. From 2010 to now, he is a researcher at the School of Energy and Power Engineering, Shandong University. He has published more than 40 papers in well-known journals in this field, including more than 20 in SCI and EI. His research area includes Green catalysis and microwave-assisted catalytic process, Thermochemical conversion and upgrading of biomass and low rank coal, and Preparation of porous functional materials.
Jing Sun
Jing Sun received his PhD degree in Energy and Power Engineering, Shandong University in 2012. She works at the post-doctoral mobile station of environmental science and engineering, Shandong University in 2013–2016. From 2016 to now, he is a researcher at the School of Energy and Power Engineering, Shandong University. His research area includes Discovery and analysis of the mechanism of microwave-induced discharge, Study on the synthesis of biodiesel, Preparation and application of new carbon nanomaterial.
Chunyuan Ma
Chunyuan Ma received his PhD degree in Harbin Institute of Technology in 1996. He is a professor and doctoral supervisor of Shandong University, director of the Engineering Research Center of the Ministry of Environmental Thermal Engineering, director of the Energy and Environment Research Institute of Shandong University, vice president of the Environmental Research Institute, vice director of the Sustainable Development Research Center of Shandong University, and director of the Cleaner Production Center of Shandong Province. In recent years, he has presided over or participated in a number of national, provincial and enterprise-commissioned research projects, and won a number of scientific research awards. More than 50 papers have been published, and more than 30 national patents have been obtained.